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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f8f15243611a80c356b70b5f2b9f452264fe43d999664a10fb2874b7b50bba6' 
  AND token = '0Kqebuv2U7wZc3rFrptNXNbCHdpCuvJ2arcDOnzyPdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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