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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8923600edbdad3b5387248e5b48e21901281da2a024031374dbfd2f8f8afcf5f' 
  AND token = 'cwgM5/Dr96PT+SAZ7yCmU44ktTQgxkR8teOhxCT/BLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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