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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3045cb76b587bcbb313f4fc75aaf4560d1b1bcff0088a5127e72120a6b585e7f' 
  AND token = 'tlMU+2KlNan5Wg5Hge0rwa9jwQ611Tv6sd+Djg8xAWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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