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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce8e814ef7237b9d349c2d864bc8e3300c144e755b3e0f6b2dc14813685329f1' 
  AND token = 'TMHl7jEGj14I6i9Cy/huWKbbN0DZPqtiSfSj57AGCw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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