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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1229e1839b03987222ab72d385ec4ade5af273a72ed5e745b6301c9b58b6a77e' 
  AND token = '6Lf8S4po7V0Q6FWh1nWIAxTBQckhOIAY7/MthfNOZiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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