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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e4c0db734f9f636fb23f819237cec0a230bb94aa75466d95e1bb4e4d42dd2a3' 
  AND token = '0eOaI+CZo3/zxXhSQ6TuumewaVih6Cr+tfABJ9bdSm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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