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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ddb552b07f92f61376f7fde780697f60fc9eeafbc609370eb46c5b427a33720' 
  AND token = '5jBQBp04iG/ECu59FLCqSfjj+Qe0gL0yQwTm6aaG/z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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