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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b9a1d27c905fbb28147123070ab470700629f78d5c1e2f4c53e382dac0bad8e' 
  AND token = 'f9Zj/GWtttis2MBBgJevABr63fjaEwbz3ezEae1uklE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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