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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98b7af6f32f0c563d56e5898b92682d473e526c7e360f8aa19fb5bea408f2973' 
  AND token = 'mZXHNz1E4SCOs26SFk+V2NSAa5cjNOS4j7amrUtvhiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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