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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cd54d98cc75e85dec7ce522fd01574f1db0905b036414475975a0bb9a3cb238' 
  AND token = 'Aps0ls1qIWp+V2zInqzyrKH1z7sJp9P+/4MMriBI750=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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