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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97ee7037a38055806dee07b95920deb901836a5bc5f21ef5ea4521b2d2d255a3' 
  AND token = 'uI5Ah9scPudXNXRR499Ev0NQ+mjWWLsx+iht5h4WqpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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