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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1c62870841813e6489de7add4056668fed979e58fa5f6fea65d8a7e62a8b3d8' 
  AND token = 'tlcqgdKvPC5fbkSWePd8J+PFAkc6sN2yW5Eif2E6zTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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