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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e61218619cd91e7e12b206253beaa93f79dcb7c33291f7632e3c64f89521fbc0' 
  AND token = '9eVCDOYxKNDUOrqmUi89a1nmd7oY+ypUtrbQOq1laAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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