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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60f5aa61066d0dac83b4e4064ef9fd49b97f7e0ab5c4c3fac81eccf90e938789' 
  AND token = 'SPEQny4WFthX9xbOHhrYyUQL5FeEBDWw8lniCNwPWGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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