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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '929527642343dedc7cc74a40dbace764a6a528d13622f6a33a8f60aa49e89551' 
  AND token = 'dMJM1GG1LOtjU0b2Z0BheqX0H6ihOFsH6hVLNUFAZ4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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