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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34ac2dbefcc492caf091e58829a0b597c448e1e0122e9aa3312b845b904a52c0' 
  AND token = 'QaxB6nWX5x877VIVthuJO1IXu16V6cdOEwChFylhC6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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