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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6b8fce47a4d98f547162e97937e2c0df5035f4fd7bdaefc9e44524c4b8fe553' 
  AND token = 'T5f4hT9mfP9pEhgSeutPcGQvpdSt7ROXqFDYf70ugx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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