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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e56381c627709793c528590af8c1dd8a7da60d80104732278a5c16f785ccbc19' 
  AND token = '7PGPCqxuGxqjt+inl14o5Ae0g/DnxAG7kKWrWz1oqIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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