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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1d3b2a4556566314740dd2942a85d5ea977ce1c3845d2310b06518ae25fc419' 
  AND token = 'lFOe29VIec9mC7T9F+R3qIfyeDbVJNmgT+MVdM2CprQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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