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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef5bc8d119bbe0a8e19c5cec5ad8b2d05e3c24b0f539d17bd0722c8b2424736c' 
  AND token = 'C3mMfaeF9Tx8SyowLHYJIbdlLuP7y+bNwxHzhnGVUtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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