SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a2d11db12d1bc8a7b8add0253d43529e2afa84f5992a7b6736b72d2fdabe94a' 
  AND token = 'Zb/ZnMnLVZvZHc+rG2yHSxswSIQEQDGBJgvxc70jU9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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