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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ef868c9ede21abc8bb0e6e4b2550afcaad7514044ee594b6eef9de5a259b461' 
  AND token = 'dgaa6mHhFaOQd505tFJqcE+w9PXqMcMRXa5iyzq3pJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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