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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da35d0ceea2ade9008a8a4a05f8447fdf725b11e4535a881cae21e8909aa9392' 
  AND token = 'YyPv/RlujO8gHfFj+/Mc7t0PKzaTCJhTngA4LY0hnn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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