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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bc38d9e71d02f5786169b26aae42a9cb31c3fd1a8a8e07281b39ab44a531203' 
  AND token = 'NpxAWqmUKjUEZwubUefBbXNd1DCS1p2wwZeL/grtWiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}