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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9da4256d318e74a693278f322c6f7c52e35f4a28b86b14f4d02029d8cb42afaf' 
  AND token = 'Rm3y3l3LEIovs4dxwSfKYke7Kd8tbgV/dcXHRTvbPC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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