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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9bd2eefbc35439fac07c8e3fd9a969b70140323f3720f7177ab10d60ef9e541' 
  AND token = 'naKHVdVWE0zGS8roFcnwkUAVA0z6UjI+v0cFSj8ppas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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