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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3ab5ec6d5e533dd6cd3ee57693fd4a7a44a9958a7dd596f84821d2329de392a' 
  AND token = 'ZcnQl/00ar8DA/Ne4v1AGh+//Ow4xBW3/+cvqjlgBlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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