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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9770e3ded11b30630eb2a0469859eb24cc796b2ce66d95874b8207c0c96f7b70' 
  AND token = '2pvSG3xp2UAPG4PQNSxwYNN0mDTPJW0sWsLwFsKYOcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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