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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03cb3fe709f6d6619d838774a01b22dce36342f8ffb833d202a5334e4ade1e50' 
  AND token = '/fG70aOCifsqfto0kVKfyM+Ej9TXxCV0LnnVf1Nmr7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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