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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '196ab14ad45e773a4ce9905c54bb7e0adf42a43030796f4663b3d5e8786325f9' 
  AND token = '5gn55B4bXxkQU4EOKYXtVa++vN6mefO2jthBXAFbv6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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