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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28d1e24f20c7927d2d5db41e254cf949a3ee7d2ceb96516a3fe2b7cdae7ea737' 
  AND token = 'zOnb/vNJ40UyZOrLBYzMnvvQyCdGBwEYdILxB3TLSJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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