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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be8579205bac734d3fa8210b9eb668fb3c00171ee70876da56dd62b2779b0d75' 
  AND token = 'W+tVICbN5z4thvl5IM55LrRIVYerS3Nha7+QLyZIrpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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