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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd219436b76a34dcec435d7bd46cde3d28b266cc83b7acc4a7ab2c4729a70df7c' 
  AND token = '4N4CRmpvVywYa0yPsPEtpdmIQX3spv0gSwN/3eJvVgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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