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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98358e0237b76322fee83d10475cc06b83bc9adf21e9d0a98c590547ef7fc234' 
  AND token = 'RC9a2avUh7y4O3nsEJJxNtkaaw6dUfaF3Imx0sNh+6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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