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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c28c5efb0bc1828072eed55db205d11c8efecb9222d6dd8615f57b19f6311e62' 
  AND token = '7nqQNxSx28CKPUgtjYIjgCB5OeBkipbkZ9KfkBpi3nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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