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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0def0c9fc50c4a8c4ff2ebb7a34c7ddfdc0e2611db90f76722835f2e0b324b6c' 
  AND token = 'BrMdkauS1ZMjPi+EYxvIEitmGI/gw+NpgHI1Ufe069s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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