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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9c14e7ffa6d9d46f0c786ca98cca2487e0507e9b33cdd8d2ac96e2a35df1e4e' 
  AND token = 'l8Mp+7iEuJE/QlslB3ogvzeDLcnZ/cuRMihklVOpqHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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