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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0af8927062e7d2fdfe39ddd7ff09ee4464b5e23bdd799de85b7a75015aebcb0' 
  AND token = 'Yf0jyouNomDv2BUt8iz3Z7kXQH3b6vERwzqOGssP0Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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