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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0ac810243f61906401bec0ef95071557565d63deef3a32220d6fc0e0036c192' 
  AND token = 'oJH4ddYEuQZifC8h5TMP1i+eSuIWjJ+0VvccR/lWgs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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