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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff34902d5a7df2af7e1f3f6e4aff99a9d2850eaaab7b783ed7941632c2079b67' 
  AND token = 'tHJz46JUqZZrFPNEMW992FIM58MV0HaoSG1PDrdgtVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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