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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb4c955ecff891ae0d96de390379daf99d9bbe9902e9aef7cb6364aa2215277d' 
  AND token = 'wjnUzWXMUiXrmd5QxavmdsrC7pSBVDBKKsn+3O+7EY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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