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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dffc2c714fd7707b5be21eb1101de14ff17c588f9955e3563100d3cf8e94ae4' 
  AND token = 't+SAWzNRPLQ4PMTV6iTcAfYxYvxGwjmADExnJF+cmAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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