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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea5ad85ca5955b8335665bb9c86f4a2eeab491961eb7ed71a30ccc0e30a6cf07' 
  AND token = 'uZqogF2cZk1UaNqTleH2s4F6BtMYVAzFDeUI+a0dz1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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