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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '129341c74a1184bb1da266f799ebd7ae11eaeebfff53bcab2e7473091676edc6' 
  AND token = 'fyg3MgYAi5mpOVWidOYRSySD0EGqiG4aeC1vGr2uoNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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