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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6368efa82c4ecc9b92dae9b1d46752499f2c420565d3d6076ae6e6ce8f5893d' 
  AND token = 'Xe1oZDnz7cHyHTKcQSjdCm702Xm/+VK/ug8INV0I3y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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