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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68796dcdc7f48c0ec167bf90ce5a6250f75bd631cd44b795471314f3f24c8b05' 
  AND token = '/FkzLafGd1JfbhgtjnopE0JwNpvnFhhEoofL0dIDzU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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