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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caf36a0acf3325be50cad78c2f6d8b59955b45a8cd573dd6acabaefa8c398567' 
  AND token = 'WcTrsk7ztcwXL4qbkRkzELsXW3sYNoDub0+kxRdRHRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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