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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '748defb8994d9d64a8519e0a2755247d225933e2653ed1f4eee2cd5f9a49fffd' 
  AND token = 'Hc3K8daKb+h4jvkWeeR9DAEa1qOZCH+oR4m5aNixJr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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