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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8173602bcbcd4db3b589bbe11c179185ab402ebc61909c020b8c434e71c725e' 
  AND token = 'N0fZqVxuwSmAItgK0QDLoPscueDRjiRVI5EjpwBK+7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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