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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18ae0c38109e78fa93bbe834ca22a18d2b9b76e04365ddda5039db69ce3d12c1' 
  AND token = 'Gs+7OgWWpbYZr1pTfbXg7oaahNYIC1BEsCey7Etexlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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