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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f47fc2175fcaa15ea37e9968fa473706640f151a59c0ba62de639e4ed7a9b6b' 
  AND token = 'jeirvXgd+IlzGpV8idWsdSPclENLZmzk+7Ptc7hmbrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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