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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4706f769edefde3882aa90a3f106818613250573181c205951613765c7d3916' 
  AND token = '/EBbLTh43qyLzz1RiSeEo1jixMkH/LYXJHsrEicgiRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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