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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e310365421c3d61e51d590acd37ba457b62be2b433ab76a1959b67a11b93521' 
  AND token = '6BVL7Q+V8pcMht4WcZRYMrBGyyhB0hiuxlBgUVxV6GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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