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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c7548c597eff22922e7144f6a9f0667fe227533c5e9bbcc1e1d0ff5e177a627' 
  AND token = 'oGfH4b2SiqZj8ItcFN8PRkWsXq7zLJUr0KMaJ3UIV+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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