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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97e738b4d3b4373ec8f6f4d1ef0725551a1996285e749953a836fe6e28654145' 
  AND token = 'Dp3gKMb4kxOY6ox9KKUWy432zkqeBXEC1F2ZL/mHeLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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