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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b5182dccac944f5783a3a75eb6020d0165403b9fa9d9638abfed5288777098c' 
  AND token = 'Jt3GxFK4mnLlJFAAjAA0Bq7QFabScsH789niGCrzHJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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