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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a680d30913ba6db92eaec80187d6db83f2744eb8640bd854a45dc9e4be189ab0' 
  AND token = 'Ptq6pNF0hCIrMCWoW0TZBCgb60tgcLJviPdnQA52g8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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