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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dab3918cb4ddc734ba4abf6996eb2e4c9ffbaeb2ccf4aed47afb5241dafbb1ca' 
  AND token = 'F9K+CiPxhDhOiR0E6U/xQep82uSu5/vCrNCKyL5FAVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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