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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e277d8fbb09383f36e48d88f7f6ac1e1c8c6b06719135905d2a0f36445dfcd0' 
  AND token = 'CvNhCCvNF8v6MROY1Nt0Mub8WQ0SXVayJRBk1Vzz60s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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