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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7f740d5f008480796e8a9f7b7deb120084080980582f38b8d7eab1760b9c51f' 
  AND token = 'fzS3MpvuAfsUgmo3zxqAr4f+B8vb1GNIao04C4P2bZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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