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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '801b51524ded93c64de53b85f4e8a9652d9312e29afd31891763963e8389aca6' 
  AND token = 'GgFfqnKwnHfkLxoq1PsVfNQ6izHrXr9Q60rTwJUfy3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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