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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c22c86dfce706299400828d699d6345a985390a2a15528e5fed02e0476624cc9' 
  AND token = 'KXk0rp5YWBy7HNjCMHBiO+HzbpuTdnLOGnGn/qSlndY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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