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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc025a94acd28ed76e301b94446256655272371dfa7ab3eafaf44ab11025ece0' 
  AND token = 'OhkRze953923nMxieBJhdp5hXpFP4yGwqRkJMFsZjEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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