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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1db1756a671ffc2a29f147507ba4bee236707014c970b39b5d5523b93a7acb7' 
  AND token = '3Jjl4eLJd8b4qD86IEcKMwUnMCLAxkWZKT70xXzKW3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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